A study on the shape between the stator poles of a homopolar magnetic bearing integrated with four C-shaped cores

Abstract

　There are two types magnetic bearings in general, heteropolar-type magnetic bearing (Heteropolar-type MB) and homopolar-type magnetic bearing (Homopolar-type MB). For each type of magnetic bearing, it has its own disadvantage. Heteropolar-Type MB cost low because of the low usage of the magnet, but high iron loss decides it is difficult to be cooling down. Homopolar-type MB has a low iron loss and can be cooling down easily, but cost is high because of high usage of magnet and has a complex structure. In this paper, our research group focused on the problem and proposed a new Homopolar-Type MB structure unifying four C-shaped cores, which can suppress the iron loss with a low usage of magnet and can be cooling down easily. What’s more, we also considerate the influences by the change of the structure and proposed the optimal one. The excellent characters of the new type Homopolar-Type MB will be shown by 3D-FEA.